| 1. |
- Wamukota, Andrew, et al.
(author)
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Global Fish Trade, Prices, and Food Security in an African Coral Reef Fishery
- 2017
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In: Coastal Management. - : Taylor & Francis. - 0892-0753 .- 1521-0421. ; 45:2, s. 143-160
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Journal article (peer-reviewed)abstract
- This study evaluated the potential impact of global fish trade on local food prices by analyzing a 16-year locally collected time series of disaggregated coral reef fish products and prices that differed in their market chain linkages-ranging from local to international markets. We were primarily interested in evaluating how local and global markets interacted with the local prices of beef, fish, and maize. There was no cointegration between the prices of exported octopus and that of maize and beef over this study period. Further, the three types of fish and associated markets responded in different ways to various price changes. For internationally traded octopus, we found a positive association between price and catch rates but no evidence that the global trade in octopus markets created local inflation, particularly the prices of the fish eaten by the poor. In general, there was no evidence for price transmission from export to nonexport fish products even though fishers appeared to focus on octopus when prices were high. Consequently, fishers' behaviors and trade policies that promote adjusting fishing effort to internationally traded fish did not appear to promote poverty or food insecurity in this fishery.
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| 2. |
- Conte, Gianpaolo, et al.
(author)
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Performance evaluation of a light weight multi-echo LIDAR for unmanned rotorcraft applications
- 2013
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In: International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XL-1/W2. - : Copernicus Gesellschaft MBH.
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Conference paper (peer-reviewed)abstract
- The paper presents a light-weight and low-cost airborne terrain mapping system. The developed Airborne LiDAR Scanner (ALS) sys- tem consists of a high-precision GNSS receiver, an inertial measurement unit and a magnetic compass which are used to complement a LiDAR sensor in order to compute the terrain model. Evaluation of the accuracy of the generated 3D model is presented. Additionally, a comparison is provided between the terrain model generated from the developed ALS system and a model generated using a commer- cial photogrammetric software. Finally, the multi-echo capability of the used LiDAR sensor is evaluated in areas covered with dense vegetation. The ALS system and camera systems were mounted on-board an industrial unmanned helicopter of around 100 kilograms maximum take-off weight. Presented results are based on real flight-test data.
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| 4. |
- Brancoli, Pedro, 1989-, et al.
(author)
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The use of life cycle assessment in the support of the development of fungal food products from surplus bread
- 2021
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In: Fermentation. - : MDPI. - 2311-5637. ; 7:3
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Journal article (peer-reviewed)abstract
- The use of food waste as feedstock in the manufacture of high-value products is a promising avenue to contribute to circular economy. Considering that the majority of environmental impacts of products are determined in the early phases of product development, it is crucial to integrate life cycle assessment during these phases. This study integrates environmental considerations in the development of solid-state fermentation based on the cultivation of N. intermedia for the production of a fungal food product using surplus bread as a substrate. The product can be sold as a ready-to-eat meal to reduce waste while generating additional income. Four inoculation scenarios were proposed, based on the use of bread, molasses, and glucose as substrate, and one scenario based on backslopping. The environmental performance was assessed, and the quality of the fungal product was evaluated in terms of morphology and protein content. The protein content of the fungal food product was similar in all scenarios, varying from 25% to 29%. The scenario based on backslopping showed the lowest environmental impacts while maintaining high protein content. The results show that the inoculum production and the solid-state fermentation are the two environmental hotspots and should be in focus when optimizing the process. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
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| 5. |
- Chen, Haizhou, et al.
(author)
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An integrated approach to evaluate the measurement capability and acceptability of acoustic emission sensors
- 2024
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In: Measurement science and technology. - : Institute of Physics. - 0957-0233 .- 1361-6501. ; 2:25132
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Journal article (peer-reviewed)abstract
- Acoustic emission (AE) is a pivotal technique in condition-based maintenance (CBM) and recent years have witnessed a significant surge in the deployment of AE sensors in industrial applications. With this increase in availability, there comes a substantial challenge: evaluating the measurement capability of sensors within specific applications. As such, this study identifies a critical need for a structured approach to evaluate the measurement capabilities of AE sensors and subsequently judge their acceptability against guideline criteria. To address this need, we present an integrated approach that systematically guides the capability evaluation of AE sensors, incorporating both qualitative and quantitative analyses. The qualitative analysis aims to scrutinize the diagnostic accuracy of sensors by assessing the detectability of features critical for diagnostics. The quantitative analysis leverages the Gage repeatability and reproducibility (Gage R&R) to statistically evaluate sensor characteristics. A comprehensive experimental study further investigates the impact of measurement sources on the sensors’ repeatability, and reproducibility. This study illustrates the qualitative findings regarding sensor’s diagnostic accuracy in both time and frequency domains, revealing promising performance in diagnostic-based evaluations. In quantitative analysis, we demonstrate the results of sensor capability in terms of repeatability and reproducibility, providing the variations of different sources in statistics-based evaluations. We thoroughly investigate the influence of significant factors, quantifying their contributions to the sensor’s measurement capability. Furthermore, we introduce metrics designed to assess sensor’s acceptability, according to explicit acceptance and rejection criteria. Our experimental results affirm that root mean square measurements are within acceptable ranges for both sensors, while spectral entropy (SE) measurements for PK15I sensor satisfy the acceptable level. For HZ136I sensor, however, SE measurements are deemed conditionally acceptable. Ultimately, the proposed approach provides a robust framework for the comprehensive evaluation of AE sensor measurement capabilities, offering invaluable guidance for sensor selection and enhancement in industrial applications.
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| 6. |
- Wu, Heng, et al.
(author)
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A Survey on Impedance-Based Dynamics Analysis Method for Inverter-Based Resources
- 2023
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In: IEEE POWER ELECTRONICS MAGAZINE. - : Institute of Electrical and Electronics Engineers (IEEE). - 2329-9207. ; 10:3, s. 43-51
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Journal article (peer-reviewed)abstract
- Impedance-based method has been increasingly adopted to assess the stability of inverter-based resources (IBRs). To get a better view of the state-of-the-art and challenges for implementing the impedance-based dynamic analysis, a survey with general/specific questions has been initiated by IEEE Task Force on Frequency-Domain Modeling and Dynamic Analysis of High-Voltage Direct Current (HVDC) and Flexible AC Transmission System (FACTS). The feedbacks are collected from universities, national labs, transmission system operators (TSOs), power plant developers, as well as IBR vendors. It is interesting to note that while many common understandings have been established in practices, certain gaps still exist among different stakeholders. This article intends to bridge this gap by sharing a summary of the survey, including questionnaires, responses from different stakeholders, and the analysis of survey results. The challenges for different stakeholders using impedance-based method are identified, which shed a light on the future research work.
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